Photochromic and luminescence properties of isomeric forms of the hydronaphthyl radicals |
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Authors: | VA Smirnov OM Andreev MV Alfimov |
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Institution: | Institute of Chemical Physics, Academy of Sciences, I42432 Chernogolovka, Moscow region, USSR |
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Abstract: | The optical properties of the hydronaphthyl radicals produced upon radiolysis and photolysis of rigid naphthalene solutions in boric acid at 300 K and alcohol, ether and methylcyclohexane at 77 K were investigated. The ESR, absorption and luminescence spectra of the two different isomeric forms of hydronaphthyl radicals have been observed. The estimated values of the lowest electronic transition in α- and β-hydronaphthyl radicals are, respectively: Eα = 2.42 ± 0.03 eV, Eβ = 2.66 ± 0.05 eV. It has been found that a reversible photo-induced interconversion between two hydroradicals takes place as well as a dark conversion from the β- to the α-isomer. Analogous photochromic behaviour of the absorption bands of biphenyl, phenanthrene, chrysene and fluorene rigid solutions have also been identified as reversible interconversion between isomeric hydroradicals. |
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